如何在Ubuntu系统中添加一个辅助IP地址

在执行此操作之前，先检查系统上的 IP 信息：

# ifconfig
或
# ip addr
 
enp0s3: flags=4163  mtu 1500
        inet 192.168.56.201  netmask 255.255.255.0  broadcast 192.168.56.255
        inet6 fe80::a00:27ff:fe97:132e  prefixlen 64  scopeid 0x20
        ether 08:00:27:97:13:2e  txqueuelen 1000  (Ethernet)
        RX packets 7  bytes 420 (420.0 B)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 294  bytes 24747 (24.7 KB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
 
enp0s8: flags=4163  mtu 1500
        inet 10.0.3.15  netmask 255.255.255.0  broadcast 10.0.3.255
        inet6 fe80::344b:6259:4dbe:eabb  prefixlen 64  scopeid 0x20
        ether 08:00:27:12:e8:c1  txqueuelen 1000  (Ethernet)
        RX packets 1  bytes 590 (590.0 B)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 97  bytes 10209 (10.2 KB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
 
lo: flags=73  mtu 65536
        inet 127.0.0.1  netmask 255.0.0.0
        inet6 ::1  prefixlen 128  scopeid 0x10
        loop  txqueuelen 1000  (Local Loopback)
        RX packets 325  bytes 24046 (24.0 KB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 325  bytes 24046 (24.0 KB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

如我所见，服务器主 IP 地址是 192.168.56.201，所以，我将下一个 IP 192.168.56.202 作为辅助 IP，使用以下命令完成。

# ip addr add 192.168.56.202/24 broadcast 192.168.56.255 dev enp0s3

运行以下命令来检查是否已分配了新的 IP。当你重启机器时，它会消失。

# ip addr
1: lo:  mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host
       valid_lft forever preferred_lft forever
2: enp0s3:  mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
    link/ether 08:00:27:97:13:2e brd ff:ff:ff:ff:ff:ff
    inet 192.168.56.201/24 brd 192.168.56.255 scope global enp0s3
       valid_lft forever preferred_lft forever
    inet 192.168.56.202/24 brd 192.168.56.255 scope global secondary enp0s3
       valid_lft forever preferred_lft forever
    inet6 fe80::a00:27ff:fe97:132e/64 scope link
       valid_lft forever preferred_lft forever
3: enp0s8:  mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
    link/ether 08:00:27:12:e8:c1 brd ff:ff:ff:ff:ff:ff
    inet 10.0.3.15/24 brd 10.0.3.255 scope global dynamic enp0s8
       valid_lft 86353sec preferred_lft 86353sec
    inet6 fe80::344b:6259:4dbe:eabb/64 scope link
       valid_lft forever preferred_lft forever

如何在 Ubuntu 16.04 LTS 中添加永久辅助 IP 地址

要在 Ubuntu 系统上添加永久辅助 IP 地址，只需编辑 /etc/network/interfaces 文件并添加所需 IP 的详细信息。

我们不应该在 dns-nameservers 行之后添加辅助 IP 地址，因为它不会起作用，应该以下面的格式添加 IP 详情。

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